Problems installing a Pioneer 3900MP deck.?.?.? No power!!! - DFWstangs Forums
 
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post #1 of 15 (permalink) Old 11-25-2007, 08:24 AM Thread Starter
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Problems installing a Pioneer 3900MP deck.?.?.? No power!!!

I have spliced the pioneer harness into the factory harness and have traced power all the way to the pioneer plug but with the plug hooked up to the deck, I can't get it to power up? I have checked my ground which is good, I have bypassed the pioneer plug with a power and ground to the head unit to just try and get it to power up and it didn't, I have checked the fuse on the back of the head unit which is good and I have gone and exchanged out the original one we purchased thinking maybe I got ahold of a bad head unit. ANY IDEAS??
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post #2 of 15 (permalink) Old 11-26-2007, 08:25 AM
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Do you have a multi meter so you can check for both powers and ground?
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post #3 of 15 (permalink) Old 11-26-2007, 09:53 AM Thread Starter
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Quote:
Originally Posted by EW
Do you have a multi meter so you can check for both powers and ground?
Yes, thats how I traced power all the way to the Pioneer plug.
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post #4 of 15 (permalink) Old 11-26-2007, 10:01 AM
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check the fuses under the dash, i put a radio in and had the same problem and we found that a fuse was blown under the dash.


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post #5 of 15 (permalink) Old 11-26-2007, 10:39 AM
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check the ACC or AAC ( i never remember.)

i've had that problem a few times.

is this being installed on a dodge truck?

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post #6 of 15 (permalink) Old 11-26-2007, 10:39 AM
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oh yeah, and that's why you don't buy pioneer.

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post #7 of 15 (permalink) Old 11-26-2007, 10:51 AM Thread Starter
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I know there aren't any bad fuses as I HAVE power at the plug but when I plug in the head unit it wont power up. I have checked the fuse on the back of the head unit visually and with a meter and it's good.

This unit is actually going into a tractor and there isn't an acc. position on the ignition.
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post #8 of 15 (permalink) Old 11-26-2007, 10:52 AM
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Sounds like a bad power supply in the deck.
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post #9 of 15 (permalink) Old 11-26-2007, 10:53 AM
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Quote:
Originally Posted by PeeWeeC5
I know there aren't any bad fuses as I HAVE power at the plug but when I plug in the head unit it wont power up. I have checked the fuse on the back of the head unit visually and with a meter and it's good.

This unit is actually going into a tractor and there isn't an acc. position on the ignition.

<---- out of ideas.

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post #10 of 15 (permalink) Old 11-26-2007, 10:53 AM Thread Starter
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I have also made a harness that I could just hook straight up to the positive/negative terminals on the battery and it still wont power up.
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post #11 of 15 (permalink) Old 11-26-2007, 10:55 AM Thread Starter
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Quote:
Originally Posted by 46Tbird
Sounds like a bad power supply in the deck.
I have already exchanged out the deck once believing that it was a problem with the deck and Im still haveing the same problem which leads me to believe that it's not the deck and the chances of getting two bad decks back to back have to be slim to none.
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post #12 of 15 (permalink) Old 11-26-2007, 01:03 PM
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hook up the constant yellow wire?

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post #13 of 15 (permalink) Old 11-26-2007, 01:30 PM
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Well, it's gonna need three things just to power up.

It needs ground (check) it needs constant power (check) and it needs a switched hot. This usually powers an internal relay to allow the constant hot lead to power the unit.

Usually, the switch hot is wired to the ACC lead from the vehicle. Since you say you don't have one, you need to provide some form of a hot lead (preferrably switched!) that will allow it to power up.

You got all three leads covered? If so, then you've got a bad power supply.
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post #14 of 15 (permalink) Old 11-26-2007, 02:25 PM Thread Starter
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Quote:
Originally Posted by 46Tbird
Well, it's gonna need three things just to power up.

It needs ground (check) it needs constant power (check) and it needs a switched hot. This usually powers an internal relay to allow the constant hot lead to power the unit.

Usually, the switch hot is wired to the ACC lead from the vehicle. Since you say you don't have one, you need to provide some form of a hot lead (preferrably switched!) that will allow it to power up.

You got all three leads covered? If so, then you've got a bad power supply.
I have a good ground, I have a constant power but I have not hooked up the (red) acc. wire due to not haveing an acc. position on the ignition. So your saying I need to hook the acc. wire up to power w/a switch? I'll give it a try when I get home.

THANKS.
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post #15 of 15 (permalink) Old 11-26-2007, 03:10 PM
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Quote:
Originally Posted by PeeWeeC5
I have a good ground, I have a constant power but I have not hooked up the (red) acc. wire due to not haveing an acc. position on the ignition. So your saying I need to hook the acc. wire up to power w/a switch? I'll give it a try when I get home.

THANKS.

Yes, you need to have that ACC wire hooked up...

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